<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.19</title>
</head>

<body>
    <script>
        //用法1
        let { age, name } = { name: 'jack', age: 20 };
        console.log(name, age);

        //用法2
        let width = 600;
        let height = 800;
        let depth;
        console.log(width, height);

         let size = {
                width: 200,
                height: 300,
            };

            //代码块语句不允许出现在赋值语句左侧，需加小括号变成表达式
            ({ width, height } = size);
            console.log(width, height);

            //对象中不存在与变量同名的属性
            ({ width, height, depth } = size);
            console.log(width, height, depth);

            //给解构的变量设置默认值
            ({ width, height, depth=400 } = size);
            console.log(width, height, depth);

            //对象属性赋值给不同名变量
            let personName, name, age;
            ({ name: personName, age } = { name: "tom", age: 20 });
            console.log(personName, name, age);
        </script>
    </body>
    
    </html>